@TexanOfTheNorth, Princess Auto has a $29 unit that works for the light duty we need for egging. It also takes AAA batteries. High temp limit is 550ºC. Emissivity is set to .95 which is OK for CI and most seasoned pizza stone temps.
Have never tried cooking burgers in a pan on the egg, I do reverse sear with the sear done in a CI skillet on the gasser side burner.